• Adobe After Effects Expressions

  synchronising two layers

  Posted by Kingsley Birkett on January 21, 2018 at 6:54 am

  Hi,

  I am really struggling to understand what I’m doing wrong, appreciate any assistance you can give.

  I have one layer that is a vertical strip with graduations and numbers 0-43000
  its dimensions are 88×22858 pixels

  I have another layer that is a rolling type odometer.

  I created a null layer which the vertical strip layer is moved vertically, ie in they Y axis.
  the number of the y position is then multiplied by a factor to cause the odometer to roll and match the vertical scale.

  unfortunately when I get to the the oppotite end of the scale it is a little out.. if I calibrate it at the centre, then its out a little at each end. any ideas ? thanks..

  Hammers Nail replied 8 years, 3 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Hammers Nail

  January 22, 2018 at 12:51 am

  Hard to tell since we can only guess how much pixels in Y occupy those numbers, how offset those are, so measure yourself what is the actual distance between e.g. baseline of number 0 and number 43000. Then, have you taken in account that you have to take in account also the first/last number of scale? Assuming that it is really 22858.0px, then if Y-min is 0, then Y-max should be = (22858.0 – 22858.0/43001)

  Nh

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